When foliar spraying a tree the most efficient in leaf absorption are apolar molecules (i.a. urea). Behind apolar molecules with somewhat less efficiency are cations (NH4, K, Ca, Mg Fe Mn Cu, Zn). The lest efficient are the anion forms (NO3, H2PO4, SO4,B4O7, MoO4, BO3). The efficiency of nutrient absorption is also dependent on the contact angle of liquid drop on the leaves and stem epidermis surface. The flatter the angle and the more thorough the coating of epidermis by droplets of solution, the better translocation of dissolved nutrients into plant cell is observed. The value of the angle can be successfully decreased by the application of surfactants which reduce surface tension of liquid droplets. - Millet